A 13,000-year-old mastodon skeleton was found during the construction of a 19th-century New York mill.

The original Uncle Sam was actually a New York meatpacker who is buried under this historic grave.

This giant monument of the RCA mascot is a beloved fixture in Albany, New York.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

The humble home where the famous beat author lived briefly and wrote one of his most famous works.

A lone historical marker off the highway and scattered debris are all that remain of this Cold War-era missile site.

An overgrown garden stands as a grim marker of an unrealized dream.

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

Through the decades, Black music stars have performed at this historic hub for music and the arts.

When it opened during the final years of the embargo, all the drinks and cigars were free.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

Home to items never before seen by the public.

The site of the climactic scene from the classic horror film is now a historic landmark.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.